Spark-arrester.



R. E. JACKSON & F. E. BELL.

SPARK ARRESTBR.

APPLICATION FILED APR. 1'7, 1918.

Patented Apr. 14, 1914.

2 SHEETS-SHEET l.

INVE N TU II S (ff.

' WITNESSES.

rron/1E;

COLUMBIA FLANOGRAPH CO WASHINGTON. D. c.

R. E, JACKSON & F. B. BELL. SPARK AREESTER.

APPLICATION FILED APB..17, 1913.

1,093,054. Patented Apr. 14, 1914.

2 SHEETS-SHEET 2.

COLUMBIA PLANOGRAPH cm, WASHINGTON. D, c

r "l Z ROBERT E. JACKSON, OF VICTORIA, AND FRANK E. BELL, 0F NQRFOLK, VIRGINIA.

SPARK-ARRESTER.

To all whom it may concern:

Be it known that we, ROBERT E. JACKSON and FRANK E. BELL, citizens of the United States, residing at Victoria, in the county of Lunenburg, and Norfolk, in the county of Norfolk, respectively, both in the State of Virginia, have invented new and useful Improvements in Spark-Arresters, of which the following is a specification.

Our present invention pertains to spark arresting means; and it contemplates the provision of a spark arrester designed more particularly, though not necessarily, for use in combination with a locomotive boiler, and constructed with a view to precluding the escape of sparks through the uptake without interfering with the free passage from the boiler of smoke and heated gases, as is necessary to properly pro-mote combustion in the fire-box, and also constructed with a view to repassing a certain proportion of the heated gases and other products of combustion through the fire-box, this latter being materially advantageous inasmuch as it affords a circulation of hot air and gases through the boiler fines when the engine is drifting, and in that way effectually prevents cooling and contraction of the fiues and the objections attendant thereon.

Other advantageous characteristics of our invention will be fully understood from the following description and claim, when the same are read in connection with the accompanying drawings, hereby made a part here of, in which:

Figure 1 is a side elevation of a locomo tive boiler equipped with our novel sparl arresting means. Fig. 2 is a longitudinal vertical section, with some parts in elevation, taken through the smoke-box of the boiler and illustrating the parts of our novel means located in the smoke-box. Fig. 3 is a transverse section taken through the smoke-box in a vertical plane in front of the foremost wall of the diaphragm, looking rearwardly.

Similar numerals of reference designate corresponding parts in all of the views of the drawings.

In the preferred embodiment of our invention, the locomotive boiler is provided with conventional fines 1, and also wit-h a conventional smoke-box 2 from which rises the usual uptake 3. We also employ, by preference, the ordinary well known exhaust pipe 4, arranged in vertical alinement with the uptake 8, and also arranged in communica- Speeification of Letters Patent.

Application filed April 17, 1913.

Patented Apr, 14, 191-11. Serial No. 761,796.

tion with the exhaust cavities in the saddles 5 of the piston cylinders comprised in the locomotive. Also communicating with the said exhaust cavities in the saddles 5 are conduits 6, which lead to and communicate with an upstanding pipe 7 disposed in the longitudinal center of the smoke-box, and adja cent the forward wall 8 thereof.

As will be observed by reference to Fig. 2, the smoke-box is divided through the inedium of a diaphragm into a compartment 9 that is in full and free communication with the fines 1, and a compartment 10 that separated from the said fines by the said diaphragm. The diaphragm referred to is preferably sectional in character, and is made up of a transverse wall 11 shaped in outline as shown in Fig. 3, a downwardly and rearwardly inclined wall 12, a wall 13 through which the exhaust pipe fl: extends, a downwardly and forwardly inclined wall lt interposed between and connected to the boiler shell and the wall 13, a wall 1 F extending downwardly and forwardly from the forward portion of the wall 13, and a foraminous plate 15 extending between and connected to the lower portions of the walls 12 and 14 and inclined slightly downward and rearward, this in order to lessen the liability of soot or other substance clogging the apertures in the plate.

Con'u'nunicating with and extending upwardly from the space between the walls 11 and 12 is the upstanding portion of a conduit 16, which upstanding portion receives the upper portion of the upright steam conduit 7, as clearly shown in Fig. 2. The said upstanding port-ion of the conduit 16 merges into a rearwardly and upwardly extending portion, and the latter, in turn, is connected in suitable manner with conduits 1. which have for their function to repass sparks heated air and gases through the fire-box of the boiler in order to prevent cooling and consequent contraction of the flues 1, as when the locomotive is drifted. As will be observed by comparison of the several figures of the drawings, the conduits 17 are carried laterally from the conduit 16, through the boiler shell, and exteriorly of said shell the said conduits are carried rearwardly at opposite sides of the boiler 1.8, and fire-box 19 to points in rear of the rear wall of the fire-box from whence they are extended through said rear wall at points 20 slightly above the bed of fire in the box, this in order that the heated air and gases supplied through the conduits 17 will contribute toward preventing cooling of the grate, and at the sime time the said heated air and gases will be ignited before again taking passage through the fines 1. The said returned air and gases will also promote combustion in the fire-box, as is obvious, and this latter is true when the locomotive is drifting and also when the locomotive is propelled by its own power and exhaust steam is supplied to the pipe l and the conduit 7.

In the practical use of our novel arrester, it will be manifest that the exhaust steam discharged through the comparatively large pipe t will create a vacuum or partial vacuum in the chamber 10 at the opposite side of the diaphragm, with reference to the fines 1, and in consequence smoke, gases and heated air will be forcibly drawn through the foraminous plate 15 and combustion will be adequately supported in the fire-box of the boiler. \Vhile smoke and other gaseous products of combustion will freely pass through the apertures of the plate 15, the passage through said plate of sparks will be elfectually prevented. This latter is due in part to the foraminous plate 15, and in part to the vacuum or partial vacuum created in the conduit 16 by the discharge therein of exhaust steam from the conduit 7, since, as will be readily understood, a portion of the smoke and heated air and gases will be forced through the conduit 16 and the conduits 17, and during their passage to the conduit 16 will tend to carry cinders past the plate 15 with the result that the Cinders will be deposited on the bottom of the compartment 9 of the fire-box.

We have entered into a detailed description of the construction and relative arrangement of the parts embraced in the present and preferred embodiment of our invention, in order to impart a full, clear and exact understanding of the same. We do not desire, however, to be understood as confining oursveles to the said specific construction an drelative arrangement of parts,

as, in the future practice of the invention,

we reserve the right to make such changes or modifications as. do not involve departure from the scope of our invention as defined in the claim appended.

Having described our invention, what we claim and desire to secure by Letters Patent, 1s:

The combination in a locomotive, of a fire box, a smoke box, fines extending between and connecting the fire box and the smoke box, a diaphragm dividing the smoke box into a rear chamber in'communication with the fines, and a forward chamber; said diaphragm including in its forward portion a' and a conduit connected with a source of steam supply and arranged to discharge steam into the said conduit that leads back to the fire box.

In testimony whereof we have hereunto set our hands in presence of two subscribing c witnesses.

ROBERT E. JAOKSGN. FRANK E. BELL.

\Vitnesses J. W. Harsrnan, WV. C. DEroRD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 1 

